You have to go strictly by the definitions for this one. A "player" by defintion (Rule 2-30) is one of the 22 team members who are in the game right now. All other team members are non-players (and thus, can legally use headsets during the game).
Be sure to read every section of Rule 2 carefully, because those definitions are the foundation for everything else in the rulebook. Common football terminology may be defined differently from what you would expect (e.g. saying "a player on the bench" makes no sense).
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